The recommended run time is usually atleast 8 hours, straight! the water filtered through one whole "turnover" isn't 100% as you may think. It really goes as below:
1'st turnover: 42% filtered / 58% unfiltered
2'nd turnover: 84% filtered / 16% unfiltered
3'rd turnover: 95% filtered / 5% unfiltered
4'th turnover: 98% filtered / 2% unfiltered
In order to achieve the maximum filtration, you must run the pump for the ENTIRE 3 or more turnovers straight. If you turn your pump off, wait, then filter some more later, it starts back at 42% filtered again. This is why many pool owners may have algal outbreaks or dirty/cloudy water even though they run 8 or more hours a day, yet they break the run time into smaller increments. The whole cycle must be done in one non-stop run.
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